Perhaps you should try some spelling variations:
sua triet » su triet, cua triet, sua tiet
danh dai » danh dau, danh sai, vanh dai
danh di » danh du, xanh di, danh dien
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
va cau » van cau, va cac, va dau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (tang ma)) hoi. lieu va cau truc va ((danh dai) OR (danh di)) sua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (tang ma)) hoi. lieu va cau truc va ((danh dai) OR (danh di)) sua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (tang ma)) hoi. lieu va cau truc va ((danh dai) OR (danh di)) sua triet*.